<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js變量作用域</title>
</head>
<body>
</body>
<script>
var test = function(){
console.log(abc);
var abc = 'abc';
console.log(abc);
};
window.onload = function(){
var abc = 'def';
test();
console.log(abc);
}
</script>
</html>
